Device for measuring pressure and / or moisture based on ambient humidity

ABSTRACT

An apparatus and method for measuring pressure and/or humidity, having at least one sensor for measuring pressure and/or humidity. The sensor has at least one capacitor having at least two electrodes that are arranged in a horizontal direction relative to one another along and on a flexible support material. At least one dielectric layer is arranged between the electrodes. At least one at least partially moisture-permeable and/or moisture-absorbing layer is arranged in some places on a side, facing away from a support material, of the electrode and/or the dielectric layer. The at least one electrode and/or the dielectric layer are arranged transversely between the support material and the moisture layer. In this way, a capacitance is at least partially changed by moisture hitting the dielectric layer, and a processing unit is designed and provided to measure and/or store this change, so as to create a capacitive moisture sensor.

The present invention relates to an apparatus for measuring pressure and/or humidity, as well as to a method for measuring pressure and/or humidity, comprising the preambles of claims 1 and 8, respectively.

The apparatus according to the invention for measuring pressure and/or humidity comprises at least one sensor for measuring pressure and/or humidity, wherein the sensor comprises at least one capacitor comprising at least two electrodes that are arranged, in particular, in a horizontal direction along and on an, in particular, flexible support material relative to one another, wherein at least one dielectric layer is arranged between the electrodes.

The horizontal direction is preferably a main extension direction of the flexible support material.

“Flexible” refers in this context to the support material being bendable and thus resilient at least in some places.

In particular, the support material may be a woven fabric, or another clothing fabric, such as, for example, a polyester.

The dielectric layer thus spaces the two electrodes apart in a horizontal direction and/or transverse direction perpendicular thereto.

According to the invention, at least one at least partially moisture-permeable and/or moisture-absorbing moisture layer is arranged at least in some places on a side, facing away from the support material, of at least one electrode and/or of the dielectric layer, wherein the at least one electrode and/or dielectric layer are thus arranged between the support material and the moisture layer in a transverse direction, such that a capacitance is at least partially changed by the moisture at least partially hitting the dielectric layer, wherein a processing unit is designed and provided to measure and/or store this change, so as to create a capacitive moisture sensor.

A capacitive moisture sensor is basically a capacitor having a dielectric that is preferably composed of a hygroscopic polymer layer that, depending on the humidity of the ambient air, takes in (absorbs) or releases (desorbs) moisture until an equilibrium state (where the diffusion gradient=0) is reached. The dielectric constant of the polymer material then changes as a function of moisture content.

The purpose of the processing unit is, inter alfa, to determine the relative humidity as accurately as possible, preferably also from a measured ambient temperature and the humidity-dependent capacitance of the sensor.

According to at least one embodiment, the apparatus for measuring pressure and/or humidity comprises at least one sensor for measuring pressure and/or humidity, wherein the sensor comprises at least one capacitor comprising at least two electrodes that are arranged, in particular, in a horizontal direction along and on an, in particular, flexible support material relative to one another, wherein at least one dielectric layer is arranged between the electrodes.

According to the invention, at least one at least partially moisture-permeable and/or moisture-absorbing layer (=moisture layer) is arranged at least in some places on a side, facing away from the support material, of at least one electrode and/or dielectric layer, wherein the at least one electrode and/or dielectric layer are thus arranged between the support material and the moisture layer in a transverse direction, such that a capacitance is at least partially changed by the moisture at least partially hitting the dielectric layer, wherein a processing unit is designed and provided to measure and/or store this change, so as to create a capacitive moisture sensor.

The moisture layer can be formed from a dielectric material. The material of the moisture layer can be different from the material of the water-impermeable layer.

In the context of the present application, a “moisture-absorbing layer” may be understood as an at least partial absorption of moisture from a surrounding medium into the layer itself. Moisture may therefore be understood as a gaseous or droplet phase in the surrounding medium. The moisture may be contained in the ambient air or any other surrounding medium of the layer.

The water or liquid content of air is generally referred to as humidity. Absolute humidity indicates how much water vapour or liquid vapour is contained in a unit volume of the gas mixture; unit of measurement: g water (or other liquid)·m⁻³. Relative humidity is the quotient from the amount of liquid vapour present in the gas at a specific temperature and the possible saturation amount of liquid vapour at the same temperature. Relative humidity is usually expressed as a percentage (%). For this purpose, the quotient is multiplied by 100. If the air is saturated, i.e. the relative humidity is 100%, part of the liquid in the air is liquid. In this case, the associated liquid-gas mixture is referred to as mist or fog.

The term “moisture” or “humidity” can be the measure of the presence of water or another liquid in or on a material (e.g. textiles) or substance or in a gas or in a room.

The moisture-absorbing moisture layer described here may therefore differ from a (moisture) layer that in particular merely absorbs liquid, inter alfa, in that the moisture-absorbing moisture layer is made from a material which, in addition to the adsorption of liquid, also absorbs moisture contained in the surrounding medium. However, it is also conceivable that the moisture-absorbing moisture layer only absorbs moisture in the surrounding medium of the layer and therefore cannot absorb liquid.

The sensor and/or the processing unit may be supplied with electrical energy by means of a battery or a fixed grid power supply.

An alternative or additional possibility is to generate electrical energy for supply to the sensor and/or processing unit by means of so-called “energy harvesting”.

Energy harvesting refers to obtaining small quantities of electrical energy from sources such as ambient temperature, vibrations, or air flows for low-power mobile devices. The structures used therefor are also referred to as nanogenerators. Due to wireless technology, energy harvesting avoids the limitations resulting from wired power supplies or batteries.

Possibilities for Energy Harvesting:

-   -   Piezoelectric crystals generate electrical voltages when         subjected to force, for example, through pressure or vibration.         These crystals may be arranged at or on the support material.     -   Thermoelectric generators and pyroelectric crystals obtain         electrical energy from temperature differences. These generators         may be arranged at or on the support material.     -   Via antennas, the energy of radio waves, a form of         electromagnetic radiation, can be captured and used for energy.         One example thereof is passive RFIDs. These antennas may be         arranged at or on the support material.     -   Photovoltaics, electrical energy from ambient light.     -   Osmosis.

According to at least one embodiment, the sensor is additionally a capacitive pressure sensor, wherein the processing unit is additionally designed and provided to measure and/or store a change in capacitance of the capacitor caused by external pressure.

Basically, a capacitive sensor is thus a sensor that works on the basis of the change in the electrical capacitance of an individual capacitor or of a capacitor system. The capacitance may be affected in different manners by the variable to be acquired, which is determined primarily by the intended use.

A capacitive sensor is based, inter alfa, on two electrodes, one of which may be the surface to be measured, forming the “plates” of an electrical capacitor, the capacitance of which or a change in the capacitance of which is measured, and may be affected as follows:

-   -   One plate is displaced and/or deformed by the effect to be         measured, whereby the spacing of the plates and thus the         measurable electrical capacitance are altered.     -   The plates are rigid, and the capacitance thereof changes when         an electrically conductive material or a dielectric is brought         into the immediate vicinity.     -   The effective plate area is altered by displacement of the         plates relative to one another, as with a variable capacitor.

In order to be better able to detect even small changes, the actual measuring electrode is often surrounded by a shield electrode, which shields the non-homogeneous edge region of the electrical field from the measuring electrode, thereby producing, between measuring electrodes of a typically grounded counter-electrode, a substantially parallel electrical field with the known characteristics of an ideal plate capacitor.

A capacitive pressure sensor is, in particular, one with which the change in capacitance as a result of flexing of a membrane and the resulting change in the plate spacing is evaluated as a sensor effect. For example, the membrane may be the above-mentioned dielectric, or the individual capacitor electrodes, which may be configured, in particular, in the form of a plate. In other words, in such an embodiment, a capacitive moisture sensor is combined in a novel manner with a capacitive pressure sensor, but without these components forming separated elements or two distinct sensors, but rather the present embodiment involves a “two-in-one” concept, where the same sensor functions both as a moisture sensor and as a pressure sensor.

According to at least one embodiment, the support material is a woven fabric, in particular into which conductor paths are woven for electrical contact between the sensor and the processing unit.

A woven fabric within the meaning of the invention is therefore a fabric that has been woven manually or by machine on the basis of individual threads.

The electrical conductor paths may therefore be additionally integrated in a fabric, in addition to the usual fibres and fabric strands, or may replace individual fabric strands constituting the fabric mesh.

Depending on the distance and the properties of the individual threads (high-twist, bulked, etc.), a rather loose fabric may be produced, such as a dressing fabric, or a dense fabric such as brocade material. Fabrics are made longitudinally resilient by means of rubber threads used as warp yarns (more bands used), or crimped and bulked yarns. They are tensioned, processed, and contracted in the resting state. Bulked yarn is composed of textured, i.e. crimped synthetic fibres. The crimping alters the properties of the synthetic fibres. The yarn spun thereon is very resilient and voluminous and has favourable thermal insulation.

For example, the support material may be part of an upholstery material of a seat, in particular a vehicle seat or an office chair. In this respect, the sensor, but preferably the entire apparatus, may be installed on the upholstery material of such a seat or integrated therein.

For example, the processing unit is designed and provided to acquire the individual moisture and pressure values, and to determine, from a combination of the individual moisture and pressure values, at least one particular characteristic value from which it is possible to derive which individual (by weight and/or size) has just occupied the vehicle seat.

For example, from the pressure measurement by the processing unit, it is possible to derive and establish a weight of the respective person. The particular humidity that the respective person gives off to the sensor may also be measured, wherein the respective characteristic value is, for example, the product of the relative humidity value times the load weight determined by the processing unit.

If such a characteristic value exceeds a corresponding limit value, then the processing unit may issue a warning, in particular by means of a connection to the electronics of the vehicle. This warning may be to the effect that the seat is overloaded or that the driver is sweating too intensely. This warning, may also, however, be replaced by a corresponding display as to what occupancy type is using the seat. An occupancy type may entail a weight classification for a particular user, or may entail whether the user is an animal, a human, or an object. Preferably, therefore, the processing unit can be integrated into display electronics of the vehicle, or at least can be connected thereto.

For this purpose, it would be conceivable for the processing unit to connect, for example, by means of Bluetooth or another wireless connection to a receiving unit of the vehicle, and for the respective characteristic value or limit value and/or the respective warning and/or the respective identifier of the user to be played back on a display of the vehicle.

Alternatively or additionally thereto, it would also be conceivable for it to be possible to externally retrieve and/or externally display these individual values and/or identifiers. For example, the car may be monitored for occupancy by an external controller.

For example, the processing unit may, by means of a data link, be connected to a triggering unit of an airbag, so that the processing unit can also control the triggering unit in an open and/or closed-loop manner, in particular in relation to a triggering time point of the airbag. Additionally or alternatively thereto, it is also possible for the processing unit to supply a controller unit of the airbag with data, for example with respect to an occupancy type, position, and/or weight of a user of the vehicle seat.

This data may cause the triggering time point and the triggering sequence of the airbag to be adapted to the user, so as to prevent personal injury to the user.

According to at least one embodiment, at least one electrode and/or dielectric layer is printed or applied by means of a thin-layer method onto the support material or onto an, in particular, water-impermeable layer arranged on the support material.

This means that at least one element, preferably both the electrode and the dielectric layer, are printed by means of a printing method onto the support material or a preferably non-electroconductive, further preferably water-impermeable layer that has been applied between the sensor and the support material.

The printing method may entail, for example, an inkjet method.

For example, the processing unit is applied to the support material in the same manner as the sensor. For this purpose, it would be conceivable, for example, to also print the processing unit, or at least one, in particular conductive, layer of the processing unit onto the support material. The data communication between the processing unit and the sensor may then occur via the above-mentioned conductor paths. These conductor paths may be woven at least partially, but preferably entirely, into the fabric, or may even themselves constitute individual fibres of the fabric.

For example, at least one electrode is configured so as to be flat. This means that a thickness of the electrodes is negligible in comparison to the surface area thereof. Such an electrode may therefore be produced, in particular, by means of a printing method.

As an alternative thereto, a thickness of at least one electrode may be at most 5 mm. For this purpose, the printing method may be applied several times, so that at least two, but preferably even more, individual pressure layers are stacked one over the other.

The electrodes may also be arranged on the support material by means of a 3D printing method.

1. The Fused Deposition Modelling (FDM) Method

Alternative Names: Fused Filament Fabrication (FFF), Fused Layer Modelling (FLM)

The method refers to layered deposition (extrusion) of a material through a hot nozzle. The consumable material is in the form of a long wire (so-called filament) on a roll and is pushed by the conveyor unit into a print head, melted therein, and deposited onto a print bed. In the process, the print head and/or print bed are movable in three directions. Layers of plastics can thus be deposited in stages on top of one another.

2. The Selective Laser Sintering (SLS) Method

Unlike the sintering method, in which materials in powder form are combined with one another under the effect of heat, this occurs selectively in the SLS method using a laser (alternatively also an electron beam or infrared beam). Therefore, only a certain quantity of the powder is molten together.

For this purpose, a thin layer of powder is constantly output by the layering unit onto the print bed. The laser (or other energy source) is now precisely aligned with individual points on the powder layer in order to form the first layer of print data. In the process, the powder is melted or fused and then solidifies again as a result of slight cooling. The powder that has not been fused remains lying around the sintered regions and serves as a support material. After one layer has solidified, the print bed is lowered by a fraction of a millimetre. The layering unit now travels across the print bed and outputs the next layer of powder. Subsequently, the second layer of print data is sintered by the laser (or another energy source). A three-dimensional object thus emerges gradually.

3. Three-Dimensional Printing (3DP)

The 3DP method functions very similarly to selective laser sintering, but instead of a directed energy source, a print head travels over the powder. This releases tiny droplets of binding agent onto the underlying powder layers, which are thus connected to one another. This method is otherwise identical to the SLS method.

4. Stereolithography (SLA)

Instead of a plastics wire or print material in powder form, liquid resins, so-called photopolymers, are used in the stereolithography method. They are hardened in layers by UV radiation and thus produce three-dimensional objects. For this purpose, the platform is lowered gradually in the resin vat. There are also variants (so-called polyjet methods) without an entire vat with liquid resin. For this purpose, an epoxy resin is applied out of a nozzle droplet by droplet and immediately hardened by a UV laser.

5. Laminated Object Manufacturing (LOM)

Alternative Name: Layer Laminated Manufacturing (LLM)

The method is based on neither chemical reactions nor a thermal process. In the process, a film or plate (for example, paper) is cut along the contour using a cutting tool (for example, a knife or carbon dioxide laser) and bonded in layers on top of one another. A layered object of bonded films laid on top of one another is thus produced by lowering the platform.

One or more water-impermeable layers and/or even the moisture layer may be applied in the same manner and/or thickness as the electrode.

According to at least one embodiment, the moisture layer completely covers the capacitor.

This may mean that the moisture layer delimits and closes off the sensor from the outside, i.e. in the transverse direction, such that the sensor is arranged between the moisture layer and the support material.

According to at least one embodiment, the sensor comprises at least one other capacitor, which is arranged below or above the capacitor in the transverse direction and is arranged on or under another water-impermeable layer so as to be spaced apart from the capacitor by this other water-impermeable layer, thus creating a capacitor stack.

The other capacitor may be constructed in the same manner as the capacitor, and also arranged in the same manner as the capacitor on the other water-impermeable layer.

Such a capacitor stack makes it very easy to refine the sensors, namely in that it is conceivable that with two sensors constituting the capacitor stack, both sensors would perform the same tasks, but the individual sensors would determine respective measurement values that could then be used to find an average value. For example, the (relative) humidity of the environment is measured by each of the two sensors, wherein the mean humidity value is determined from these two measurement values. The same may occur accordingly with the pressure measurement, thus enabling an especially exact accuracy of the overall measurement, in particular of a combination of the measurements of (relative) humidity and the respective pressure.

According to at least one embodiment, the water-impermeable layer and/or the other water-impermeable layer at least partially constitutes the dielectric layer.

This may mean that instead of the separate positioning of a dielectric layer beside the water-impermeable and/or beside the other water-impermeable layer, this dielectric layer may itself be formed by the water-impermeable layer and/or the other water-impermeable layer.

Such a production of the dielectric layer by the water-impermeable layer(s) therefore forms an especially easy and low-cost method of production for a low-cost apparatus.

Apart from that, it may basically be provided that the electrodes, the dielectric layer, and the water-impermeable layer(s) are arranged in such a manner in relation to one another that an electrical short circuit can at least be prevented.

According to at least one embodiment, a maximum thickness of the moisture layer amounts to at least 30% and at most 80% of the maximum thickness of the water-impermeable layer and/or the maximum thickness of the other water-impermeable layer.

This not only ensures a sensor that is built to be especially flat, but also guarantees an especially quick response time to changes in humidity. Therefore, the humidity acting on the moisture layer from the outside need not pass through large distances to reach the dielectric.

The present invention also relates to a method for measuring pressure and/or humidity, wherein it should be noted in particular that all of the features disclosed for the apparatus described above are also disclosed for the method described here, and vice versa.

According to at least one embodiment, the method for measuring pressure and/or humidity first comprises a first step by means of which at least one sensor for measuring pressure and/or humidity is provided, wherein the sensor comprises at least one capacitor comprising at least two electrodes that are arranged, in particular, in a horizontal direction along and on an, in particular, flexible support material relative to one another, wherein at least one dielectric layer is arranged between the electrodes.

According to the invention, at least one at least partially moisture-permeable and/or moisture-absorbing moisture layer is arranged at least in some places on a side, facing away from the support material, of at least one electrode and/or of the dielectric layer, wherein the at least one electrode and/or the dielectric layer are thus arranged between the support material and the moisture layer in a transverse direction, such that a capacitance is at least partially changed by the moisture at least partially hitting the dielectric layer, wherein a processing unit measures and/or stores this change, so as to create a capacitive moisture sensor.

The method described above then has the same advantages and advantageous configurations as the apparatus described above.

The invention described here shall be described in greater detail below with reference to two embodiments and the corresponding drawings.

Like components or similarly-behaving components are provided with like reference signs.

FIG. 1 shows a first embodiment of an apparatus according to the invention for measuring pressure and/or humidity.

FIG. 2 is a schematic perspective view of an exploded drawing, depicted in relation to the order of layers.

FIG. 3 shows another embodiment of an apparatus described here.

As can be seen in FIG. 1, an apparatus 100 for measuring pressure and/or humidity is illustrated therein.

A sensor 1 is depicted by way of example therein, wherein the sensor 1 shows a capacitor stack comprising a capacitor 20, as well as a capacitor 30, wherein the individual electrodes 10, 11 of the capacitors 20, 30 are arranged over one another in the horizontal direction H1, wherein it goes without saying that, as an alternative thereto, however, an assembly of the individual electrodes 10, 11 of an individual capacitor 20, 30 may run or be arranged in the transverse direction Q1, which runs perpendicularly to the horizontal direction H1, and thus also perpendicularly to the main extension direction of the sensor 1 illustrated therein.

The individual electrodes 10, 11 are arranged on a support material 13. The support material 13 may be, in particular, a woven fabric, in particular a flexible woven fabric.

A water-impermeable layer 4 is arranged on the support material 13, wherein the two electrodes 10, 11 of the capacitor 20 are printed in the horizontal direction H1 on this water-impermeable layer 4.

The electrodes 10, 11 of the capacitor 20 are completely surrounded by another water-impermeable layer 14. The other capacitor 30, comprising corresponding electrodes 10, 11, is printed on this water-impermeable layer 14 in the same form and manner. In addition, in the present embodiment, exposed outer surfaces of the individual electrodes 10, 11 of the other capacitor 30 are preferably completely surrounded by a water-permeable and/or water-absorbing moisture layer 3.

Via this moisture layer 3, water can hit a dielectric layer 4, which in the present case is arranged between the respective electrodes 10, 11 of a capacitor 20, 30 in the horizontal direction H1.

In the present embodiment of FIGS. 1 and 2, the water-impermeable layer 4 itself constitutes a dielectric layer 4 of the capacitor 20. The same is true for the other water-impermeable layer 14 in relation to the other capacitor 30.

Impact and penetration of the humidity through the moisture layer 3 alter the dielectric properties, in particular, of the dielectric layer 2 of the other capacitor 30.

Also visible is a processing unit 5 that has a data connection with the two capacitors 20, 30, wherein this processing unit 5 is designed and provided to measure a change in the relative humidity of the environment and/or of the moisture layer 3.

The “stackwise” arrangement depicted in FIG. 1 and the fact that the other water-impermeable layer 14 prevents the capacitor 20 from coming into contact with humidity may therefore provide that only the other capacitor 30 and the dielectric layer 4 thereof are exposed to the humidity. For this purpose, the processing unit 5 may then compare a change in the capacitance of the other capacitor 30 with the stable capacitance of the capacitor 10, such that, for this purpose, an especially simple comparison may be produced in the change in the relative humidity and/also in the respective load pressure.

The arrow depicted in FIG. 1 also illustrates a direction of pressure in which the sensor 1 is subjected to pressure. Both can preferably be measured, evaluated, and stored by the sensor 1 and, in particular, by the apparatus 100. This is achieved in particular by the processing unit 5, which is presented as being essential in the invention and can also additionally measure and evaluate corresponding pressure values and, in this respect, related changes in the capacitance of the individual sensors 1, such that the processing unit 5 is additionally designed and provided to measure and/or store a change, caused by external pressure, in the capacitance of the capacitor 20 and, in particular, also of the other capacitor 30.

The moisture layer 3 may be configured so as to be flexible or non-flexible. It is also possible for the moisture layer 3 to be configured as a woven fabric. In particular, it may be a woven fabric that was mentioned by way of example in the introductory part of the present application. It is, however, also possible for the moisture layer 3 to be a substrate that is applied, for example adhered, to the other capacitor 30, for example in the form of an epitaxy or bonding process.

The water-impermeable layer 14 and/or the water-impermeable layer 15 may also be flexible and non-flexible, in particular may also be formed as a woven fabric or a substrate in the same manner as the moisture layer 3.

It may also be advantageously envisaged for the electrodes 10, 11 of the two capacitors 20, 30 to be printed onto the water-impermeable layer 14 and the other water-impermeable layer 15 in the form of a printing process, for example an ink jet printing process.

FIG. 2 illustrates an exploded view, wherein, in particular, the respective arrangement of the electrodes 10, 11 of the capacitors 20, 30 emerges from FIG. 2. Also visible, in turn, is the direction of force, represented by the direction of the arrow, on the sensor 1, as well as the humidity acting through the individual, schematically depicted drops. In particular, it is again evident that the humidity penetrates in particular between the electrodes 10, 11, and has a, for example, significant effect on the electrical property at the particular water-permeable layer 14, such that the capacitance of at least the other capacitor 30 changes, as explained in FIG. 1.

In another embodiment of the invention described here, FIG. 3 illustrates that the sensor 1 may be composed of two electrodes 10 and one electrode 11. The electrodes 10 have one polarity (preferably the same polarity), whereas the electrode 11 has a different polarity therefrom, wherein, however, the exploded view of the left part of FIG. 3 in the right partial image in FIG. 3 illustrates and shows that three water-impermeable layers 4, 14, 15 are used. The electrodes 10 may also have different polarities and/or electrical potentials. The electrodes 10 may also be electrically connected to one another.

For example, the electrodes 10, 11 may also each have and/or generate a distinct polarity and/or a distinct electrical potential. The same may also apply to the ones in the following drawings in relation to the electrodes.

For example, the lowermost water-impermeable layer is in turn the water-impermeable layer 14, and the subsequent water-impermeable layer 15 and the water-impermeable layer 16 arranged thereon in the transverse direction Q1 are another water-impermeable layer, wherein in each case an electrode is applied, in particular printed, onto a separate water-impermeable layer.

This stacking of the individual water-impermeable layers 14, 15 and 16, by merging these layers, therefore produces the capacitor 20 illustrated in the left part of FIG. 3, wherein in this case, in the transverse direction Q1, the electrodes 10 are each arranged on different planes, as can be seen in the corresponding partial view.

As an alternative hereto, the electrode 11 may also be applied with at least one of the electrodes 10 in a shared plane, i.e. on or in a shared water-impermeable layer 14, 15, 16, such that, for example, only the second one of the electrodes 10 still needs to be stacked onto a separate water-impermeable layer 14, 15, 16.

In principle, therefore, the individual electrodes 10, 11 may be arranged in different planes relative to one another in the Q1 direction, for example a pairwise association of precisely one water-impermeable layer 14, 15, 16 with precisely one electrode 10, 11.

The invention is not limited by the description with reference to the embodiment. Rather the invention encompasses every novel feature, as well as every combination of features, including, in particular, every combination of features in the claims, even if such feature or combination is not itself explicitly set forth in the claims or in the embodiments.

LIST OF REFERENCE SIGNS

-   1 Sensor -   3 Moisture layer -   4 Dielectric layer/water-impermeable layer -   5 Processing unit -   10 Electrode -   11 Electrode -   12 Electrode -   13 Support material -   14 Water-impermeable layer -   15 Water-impermeable layer -   20 Capacitor -   30 Capacitor -   100 Apparatus -   200 Method -   H1 Horizontal direction -   Q1 Transverse direction 

The invention claimed is:
 1. An apparatus for measuring pressure and/or humidity comprising at least one sensor (1) for measuring pressure and/or humidity, wherein the sensor (1) comprises at least one capacitor (20) comprising at least two electrodes (10, 11) that are arranged in a horizontal direction (H1) relative to one another along and on a flexible support material (13), wherein at least one dielectric layer (4) is arranged between the electrodes (10, 11), and further wherein the sensor (1) is a capacitive pressure sensor, wherein the processing unit (5) is arranged and provided for measuring and/or storing a capacitance change of the capacitor (10, 20) caused by external pressure, and further wherein a capacitive pressure sensor is such a sensor in which the capacitance change due to the deflection of a membrane and the resulting change in the plate spacing is evaluated as a sensor effect, so that the membrane is the dielectric layer (4) or the individual capacitor electrodes (10, 11), characterised in that at least one at least partially moisture-permeable and/or moisture-absorbing moisture layer (3) is arranged at least in some places on a side of at least one electrode (10, 11) and/or of the dielectric layer (4), facing away from the support material (13), wherein the at least one electrode (10, 11) and/or the dielectric layer (4) are thus arranged between the support material (13) and the moisture layer (3) in a transverse direction (Q1), such that a capacitance is at least partially changed by moisture at least partially hitting the dielectric layer (4), and wherein a processing unit (5) measures and/or stores this change, so as to create a capacitive moisture sensor.
 2. The apparatus (100) according to claim 1, characterised in that the processing unit (5) measures and/or stores a plurality of capacitance changes caused by external pressure, in the capacitor (20).
 3. The apparatus (100) according to claim 1, characterised in that the support material (13) is a woven fabric into which electrical conductor paths are woven for electrical contact between the sensor (1) and the processing unit (5).
 4. The apparatus (100) according to claim 1, characterised in that at least one electrode (10, 11) and/or the dielectric layer (4) is printed or applied by means of a thin-layer method onto the support material (13).
 5. The apparatus (100) according to claim 1, characterised in that the moisture layer (3) completely covers the capacitor (20).
 6. The apparatus (100) according to claim 1, characterised in that at least one electrode (10, 11) and/or the dielectric layer (4) is printed or applied by means of a thin-layer method onto a water-impermeable layer (14) arranged on the support material (13).
 7. The apparatus (100) according to claim 6, characterised in that the sensor (1) further comprises at least a second capacitor (30), which is arranged above or below the capacitor (20) in the transverse direction (Q1), and is arranged on or under another water-impermeable layer (15) spaced apart from the capacitor (20) by the other water-impermeable layer (15), thereby creating a capacitor stack.
 8. The apparatus (100) according to the claim 7, characterised in that the water-impermeable layer (14) and/or the other water-impermeable layer (15) at least partially form the dielectric layer (4).
 9. A method (200) for measuring pressure and/or humidity comprising; a) a first step in which at least one sensor (1) for measuring pressure and/or humidity is provided, wherein the sensor (1) further comprises at least one capacitor (20) comprising at least two electrodes (10, 11) that are arranged in a horizontal direction (H1) relative to one another along and on a flexible support material (13), wherein at least one dielectric layer (4) is arranged between the electrodes (10, 11), further characterised in that at least one at least partially moisture-permeable and/or moisture-absorbing moisture layer (3) is arranged at least in part on a side, facing away from the support material (13), of the at least one electrode (10, 11) and/or of the dielectric layer (4), and wherein the at least one electrode (10, 11) and/or the dielectric layer (4) are thus arranged between the support material (12) and the moisture layer (3) in a transverse direction (Q1), such that a capacitance is at least partially changed by the moisture at least partially hitting the dielectric layer (4), wherein a processing unit (4) measures and/or stores this change, so as to create a capacitive moisture sensor, and further wherein the sensor (1) is additionally a capacitive pressure sensor, wherein the processing unit (5) is additionally arranged and provided for measuring and/or storing a capacitance change of the capacitor (10, 20) caused by external pressure, and further wherein a capacitive pressure sensor is such a sensor in which the capacitance change due to the deflection of a membrane and the resulting change in the plate spacing is evaluated as a sensor effect, so that the membrane is the dielectric layer (4) or the individual capacitor electrodes (10, 11), and b) a second step of measuring and reporting said change. 